Explaining the Differences Between Function Module and Subroutine in SAP ABAP

When discussing SAP ABAP programming, it is important to understand the distinctions between a function module and a subroutine. Here are the main differences:

Function Module:

• Can be called from within and outside of the SAP system.
• Can be created as a standalone object and reused across multiple programs or function modules.
• Provides better encapsulation and modularity as it can have its own interface and parameters.
• Can be remotely called in a distributed environment.

Subroutine:

• Can only be called within the program it is defined in.
• Exists within the same program and does not have a separate identity like a function module.
• Does not have its own interface and parameters, and shares the data directly within the program.
• Cannot be called remotely and does not support reusability across programs.

Understanding these differences is crucial for SAP ABAP programmers to design efficient and maintainable programs.